package com.ruoyi.web.controller.common;

import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.aliyun.oss.model.GeneratePresignedUrlRequest;
import com.ruoyi.common.annotation.Anonymous;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;
import com.ruoyi.common.config.RuoYiConfig;
import com.ruoyi.common.core.domain.AjaxResult;
import com.ruoyi.common.utils.StringUtils;
import com.ruoyi.common.utils.file.FileUploadUtils;
import com.ruoyi.common.utils.file.FileUtils;
import com.ruoyi.common.utils.file.OssUtils;
import com.ruoyi.framework.config.ServerConfig;

/**
 * 通用请求处理
 * 
 * @author ruoyi
 */
@RestController
@RequestMapping("/common")
@Anonymous
public class CommonController
{
    private static final Logger log = LoggerFactory.getLogger(CommonController.class);

    @Autowired
    private ServerConfig serverConfig;
    
    @Autowired
    private OssUtils ossUtils;

    private static final String FILE_DELIMETER = ",";

    /**
     * 通用下载请求
     * @param fileName 文件名称
     * @param delete 是否删除
     */
    @GetMapping("/download")
    public void fileDownload(String fileName, Boolean delete, HttpServletResponse response, HttpServletRequest request)
    {
        try
        {
            if (!FileUtils.checkAllowDownload(fileName))
            {
                throw new Exception(StringUtils.format("文件名称({})非法，不允许下载。 ", fileName));
            }
            
            // 如果是OSS文件（包含https://），从OSS下载
            if (fileName.startsWith("https://"))
            {
                String realFileName = fileName.substring(fileName.lastIndexOf("/") + 1);
                response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
                FileUtils.setAttachmentResponseHeader(response, realFileName);
                
                InputStream inputStream = ossUtils.downloadFile(fileName);
                byte[] buffer = new byte[1024];
                int bytesRead;
                while ((bytesRead = inputStream.read(buffer)) != -1)
                {
                    response.getOutputStream().write(buffer, 0, bytesRead);
                }
                inputStream.close();
                
                if (delete)
                {
                    ossUtils.deleteFile(fileName);
                }
            }
            else
            {
                // 本地文件下载（兼容旧文件）
                String realFileName = System.currentTimeMillis() + fileName.substring(fileName.indexOf("_") + 1);
                String filePath = RuoYiConfig.getDownloadPath() + fileName;

                response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
                FileUtils.setAttachmentResponseHeader(response, realFileName);
                FileUtils.writeBytes(filePath, response.getOutputStream());
                if (delete)
                {
                    FileUtils.deleteFile(filePath);
                }
            }
        }
        catch (Exception e)
        {
            log.error("下载文件失败", e);
        }
    }

    /**
     * 通用上传请求（单个）
     */
    @PostMapping("/upload")
    public AjaxResult uploadFile(MultipartFile file) throws Exception
    {
        try
        {
            // 使用阿里云OSS上传
            Map<String, Object> map = ossUtils.uploadFile(file);
            String url = map.get("url").toString();
            String path = map.get("path").toString();
            String fileName = path.substring(url.lastIndexOf("/") + 1);
            // url是私有权限
            AjaxResult ajax = AjaxResult.success();
            ajax.put("url", path);
            ajax.put("fileName", path);
            ajax.put("newFileName", fileName);
            ajax.put("originalFilename", file.getOriginalFilename());
            return ajax;
        }
        catch (Exception e)
        {
            return AjaxResult.error(e.getMessage());
        }
    }

    /**
     * 通用上传请求（多个）
     */
    @PostMapping("/uploads")
    public AjaxResult uploadFiles(List<MultipartFile> files) throws Exception
    {
        try
        {
            List<String> urls = new ArrayList<String>();
            List<String> fileNames = new ArrayList<String>();
            List<String> newFileNames = new ArrayList<String>();
            List<String> originalFilenames = new ArrayList<String>();
            
            for (MultipartFile file : files)
            {
                // 使用阿里云OSS上传
                Map<String, Object> map = ossUtils.uploadFile(file);
                String url = map.get("url").toString();
                String path = map.get("path").toString();

                String fileName = path.substring(url.lastIndexOf("/") + 1);
                
                urls.add(url);
                fileNames.add(path);
                newFileNames.add(fileName);
                originalFilenames.add(file.getOriginalFilename());
            }
            
            AjaxResult ajax = AjaxResult.success();
            ajax.put("urls", StringUtils.join(urls, FILE_DELIMETER));
            ajax.put("fileNames", StringUtils.join(fileNames, FILE_DELIMETER));
            ajax.put("newFileNames", StringUtils.join(newFileNames, FILE_DELIMETER));
            ajax.put("originalFilenames", StringUtils.join(originalFilenames, FILE_DELIMETER));
            return ajax;
        }
        catch (Exception e)
        {
            return AjaxResult.error(e.getMessage());
        }
    }

    /**
     * 本地资源通用下载
     */
    @GetMapping("/download/resource")
    public void resourceDownload(String resource, HttpServletRequest request, HttpServletResponse response)
            throws Exception
    {
        try
        {
            if (!FileUtils.checkAllowDownload(resource))
            {
                throw new Exception(StringUtils.format("资源文件({})非法，不允许下载。 ", resource));
            }
            
            // 如果是OSS文件，从OSS下载
            if (resource.startsWith("https://"))
            {
                String downloadName = resource.substring(resource.lastIndexOf("/") + 1);
                response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
                FileUtils.setAttachmentResponseHeader(response, downloadName);
                
                InputStream inputStream = ossUtils.downloadFile(resource);
                byte[] buffer = new byte[1024];
                int bytesRead;
                while ((bytesRead = inputStream.read(buffer)) != -1)
                {
                    response.getOutputStream().write(buffer, 0, bytesRead);
                }
                inputStream.close();
            }
            else
            {
                // 本地资源路径
                String localPath = RuoYiConfig.getProfile();
                // 数据库资源地址
                String downloadPath = localPath + FileUtils.stripPrefix(resource);
                // 下载名称
                String downloadName = StringUtils.substringAfterLast(downloadPath, "/");
                response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
                FileUtils.setAttachmentResponseHeader(response, downloadName);
                FileUtils.writeBytes(downloadPath, response.getOutputStream());
            }
        }
        catch (Exception e)
        {
            log.error("下载文件失败", e);
        }
    }
    /**
     * 删除文件
     * @param fileName 文件名称或URL
     */
    @PostMapping("/delete")
    public AjaxResult deleteFile(@RequestBody String fileName)
    {
        try
        {
            if (StringUtils.isEmpty(fileName))
            {
                return AjaxResult.error("文件名不能为空");
            }
            
            // 如果是OSS文件（包含https://），从OSS删除
            if (fileName.startsWith("https://"))
            {
                ossUtils.deleteFile(fileName);
            }
            else
            {
                // 本地文件删除（兼容旧文件）
                String filePath = RuoYiConfig.getDownloadPath() + fileName;
                boolean result = FileUtils.deleteFile(filePath);
                if (result)
                {
                    return AjaxResult.success("文件删除成功");
                }
                else
                {
                    return AjaxResult.error("文件删除失败");
                }
            }
        }
        catch (Exception e)
        {
            log.error("删除文件失败", e);
            return AjaxResult.error("删除文件失败: " + e.getMessage());
        }
        return AjaxResult.success();
    }


}
